If you already have a stock fan can you take it off (getting the zalman9500 and as5) and apply that even though you already have the stock thermal paste melted on the processor?
I use regular household rubbing alcohol and a lint free cloth. Get it all of. then put a little bit of AS5 on the cpu and smooth it out slighty, then just set the hsf on it.
If you want the best possible cooling power I think the tuniq tower is the king. it is ****ing huge but works. You put a delta 180cfm fan in it. o ya.